Information about mountain weather and climate is an essential part of a whole set of information for the end users the NMHS prepares regularly. We are trying to make the best use of all the ...available media taking into account their peculiarities, but how much interest show from NHMS independent media for mountain climate and weather? How to reach and approach public/users in the most efficient way? Are we able to provide enough and adequate information about peculiar and rapidly changing weather in the mountains to the end users? Is there a need for indices describing the impact of the atmosphere on human beings and not only values of single weather variables? Do we simplify too much? Information gets its real value only when being used, thus it has to be tailored up to the users needs and delivered when needed. Differences even at a very short distance could be significant, great variability and strong gradients require quite dense network. Do we pay enough attention to measurements in the mountains?
This paper reports an innovative power converter modulation strategy that converts energy from a poly-phase variable frequency source to a single-phase fixed frequency load using only one of the ...customary two six-switch bridge circuits characteristic of a dc link based power converter. To achieve this, a six-switch dc link CPRWM inverter is creatively modulated with two voltage components. The application is single- phase, fixed frequency power generation from a variable frequency wind energy conversion system, which uses an induction generator, a converter, and a zero sequence filter. Modulating the converter for a three-phase balanced positive sequence voltage component at the induction generator's optimum operating frequency transfers energy from the generator to the converter. At the same time, modulating the converter for a three-phase fixed frequency zero sequence voltage component transfers the energy from the converter to the load through a zero sequence filter. The two voltage components are separated by the ungrounded induction motor's natural rejection of zero sequence components and the zero sequence filter's natural rejection of positive sequence components. Unity power factor output is readily achieved. This paper presents operation, control, theoretical calculations, simulations, and experimental results that reveal important limitations of this energy conversion scheme with a single converter.
The design and testing of a purely ultracapacitor energy storage system for the improvement of hybrid electric vehicles is presented. The system utilizes two large ultracapacitor banks for energy ...storage and a dc-dc boost converter that is capable of supplying 8 kW for voltage regulation. The system provides greater roundtrip efficiency over batteries, improves a vehicle's ability to recapture energy from regenerative braking, and is controlled and protected by a microcontroller. The paper presents design considerations, simulation, and hardware results of the system.
Svezost hruha--metode ocenjevanja kakovosti Cegnar, F
Zbornik Biotehniske fakultete univerze Edvarda Kardelja v Ljubljani. = Research reports Biotechnical Faculty University Edvard Kardelj Ljubljana. Agricultural Issue,
1980, Letnik:
33
Journal Article
A surgical procedure that ensures intraamnionic inoculation of the bovine fetus is described. Right flank surgical operation was performed, using a "grid"-type entry though the abdominal muscles. A ...portion of the uterus containing 1 fetal leg was presented for inoculating the test material between the hooves. The procedure was rapid and simple to do and was safe for both the dam and the fetus.
